242 Bulletin American Museum of Natural History. [Vol. XXXIV, 
Specimens examined, 14.—Colombia: Cocal, 2, type and topotype 
(Am. Mus.); Ricuarte, 4 (Am. Mus.); Barbacoas, 8 (Am. Mus.). 
Remarks.— The occurrence of this strongly marked local form between 
the ranges of typical gerrard: and subspecies versicolor is quite unexpected. | 
So far as now known, the range of subspecies gerrardi is the coast lowlands in 
the Chocé district, from Quibdo southward. [See Addenda, p. 308.] Bar- 
bacoas specimens are referable to mzlleri, which subspecies is otherwise known 
only from two localities on the western slope of the southern part of the 
Western Andes, Cali and Ricuarte, at altitudes of about 3000 to 5000 feet. 
Mesosciurus gerrardi versicolor (Thomas). 
Text Fig. 6 (p.. 163). 
Sciurus versicolor THomas, Ann. and Mag. Nat. Hist. (7), VI, p. 385, Oct. 1900. 
Type locality.— Cachabi (or Cachavi), Province of Esmeraldas, Ecuador; 
altitude 528 feet (“160 m.”’). 
Geographic distribution.— Northwestern Ecuador, from sea level to about 
3500 feet. | | 
Description.— Similar in coloration to M. gerrardi gerrardi, but smaller. 
Some specimens are indistinguishable from true gerrardi, and it is difficult 
to give a distinctive diagnosis of either, owing to the wide range of individual 
variation, but the southern form (versicolor) appears to average much smaller 
than typical gerrardt. 
__ Eight specimens from near the type locality (San Xavier, Pambilor, and 
Carondelet, altitude 60 to 160 feet), collected and measured by G. Fleming, 
give the following: Total length, 420 (404-444); head and body, 219 (200- 
237); tail vertebree, 197 (190-216); hind foot (s. u.), 54 (53-56). Skulls 
of the same specimens, total length, 54.5 (53-56.3); zygomatic breadth, 
32.8 (31-34); interorbital breadth, 18.3 (17-19); breadth of braincase, 
24.7 (24-25.5); length of nasals, 16.6 (15-17.3). } 
Specimens examined, 16.— Ecuador: Cachavi, 2, type and paratype 
(Br. Mus.); Paramba, 2 (Br. Mus.); San Xavier, 5 (Br. Mus. 2, Nat, Mus. 
3);-Pambilor, 2 (Nat. Mus.); Carondelet, 3 (Nat. Mus.); Esmeraldas, 2 
(Am. Mus.). 
Remarks.— M. gerrardi versicolor is not easy to characterize so that it 
may be readily distinguished from frequent specimens of true gerrardi, 
owing to the wide range of individual variation common to both forms, 
through which specimens from northwestern Ecuador may be found which 
are practically indistinguishable from others from the Chocé of Colombia, 
yet there is a slight average difference in both color and size. Besides this 
